function drawVisualization() {
  // Create and populate the data table.
  var data = google.visualization.arrayToDataTable([
    ['Label', 'Value'],
    ['Memory', 80],
    ['CPU', 55],
    ['Network', 68]
  ]);

  // Create and draw the visualization.
  new google.visualization.Gauge(document.getElementById('visualization')).
      draw(data);
}
